puget



J. E. L. PUGET.

RELAY FOH TELEPHONE CIRCLHTS.

APPLlcATloN mw ma. 15, 19121.

Patentd Dec. 5, 1922.

2 SHEETS-'SHEET l.

/l l. /Az bi? rl l F i YI. qll lt l: Il ii l CL z wuz 1, l, --MIHIIIIM LTf 'i1 J. E. L. PUGET.

RELAY FOR LEPHONE CLRCUIXS.

APPLICATION FILED FEB. 5E, |921. 1,437,679. Patented 906.51922.

I H {s} 14 Hf im snpargqmd nmpliatiun combine tha i Th@ lim-muntum ofthe @qutigg nal'msuf [t la either a al r-ewmtnu of Ehe {E} :md (3) shownthat. tha alimmatqn rellw Whmh starts to wi igtlr n; 1m under- :md forexam Vrah, between the equntign gxnatlunmld a diminution of the mmplify-(l), the 1512i, 0I' e uqsmtlrm and thisV of. tha relug?, mamon (3) nEmenr eqsnaham in if@ umrdmg to tlm m'rntm the mneimzs al) -u' mad 4:.dus to the sxmndmj.' excitations ars elmi- 10u rangement consisting of atriode valve pro- `vided p acteristics of the valve. Fig. 2showsdiagrammatically an arrangement .accom-ding.. to the invention inwhich there is otll- In the iia'grarnzli` i", 'denote the of the upcircuit, line Lz L',V of. the down circuit. A e wires Ll L24 aredirectly connected two wires the two wires together at a point of fromwhich-mises cer- A.

tam shunt circuits are taken; theother wires I are'connected bythesecondary s, of a transformer T certain shunt circuits being connected-tothe terminals aand b of this secondary. t The system comprisesessentiall A triade valve Ancelled the balancin valve, a triode valve'A2, called the amplifying valve1 a' transformer Tl yfor the A2,thetransformer T, and' a shunt R for the late filament circuit -of'thebalancing. valve In the diagram a sin lev late battery B is shown inorderto esta. lish the potentials of the plates of the two valves, buttwo baltteriesfor heating the filament, one foreach of the valves A, andA,. This arrangement is inmaterial' as concerns-t e invention. A platebattery .might be su plied-for each of thetwo valvesor' a sin e heatingbattery for the' two lfilaments. lgf 'the potentials of the plates Pland-P, are Vdetermi-ned Iby means oit ab single batteryBit is necessaryto insert selffimlneta-nces 1 lll l', and capacities (lx and Grin theusunlmann'er, but this also is immaterial as regards the invention.` bnbn, r1, r', denote respectively the heating batteries and the regulatingi sistances of; the filaments ofthe valves. A. A..

-'lheA action of the arrangement is as fol- |ows:

When u. conversation is exchanged between the up line L, and U1 and thedown line L, L n: difference of potential is set up betweeuthe point oot the conductor Ll o Lz and the oint b of the conductor Ll o b L2. Thisdi erence of potential 'ves rise to a current which traverses theprimary p1 of the transformer T1, the circuit being formed, for example,over the shunt R connected at Q to the primary p1.- The current in p,induces through the secondary s, of the transformer Tl a difference ofpotential 'ug between the fila-ment I4"2 and the grid 'G2 of theamplifying valve Ar The plate current which traverses the primary p, ofthe transformer 'I2 reproduces and ampliiies the exciting current whichcirculates in the priuirrj.' 7),. The transformer T, sets up.consequently` between the two points a and 'li with means. for modifyingthe chur- T one amplifying stop..

'(4-l the current in th g al andlb', being the 1,43v,ore

a telephonie electromotive force E depending on the initial excitingolectromntive force E applied between the points o and b. If the valvesand the transformers T1 and aref suitably chosen amplification will tplace.

The secondary amplification can be avoided if the electromotiveforce Eapplied. between. aand b vtl es notV set up lany current in the'primar'yp1 of the-transformer T1. `jAlSo, by virtue of the equations (4') and eprimary p, debetfveen the plate ponds on the 'and 4filament. and-thepotential ul between so is lgiven by the formula:

where R is the resistance of the shunt R; constants of the valve A1,under theexisting conditions.

- Also, if We call :aI and a, the respective induc'tancesofthe up anddown lines, z', the current vwhich circulates in the secondary of thetransformer T2, neglecting the grid current: l

. (di erenoe of'p'ctential between a andV 0) 95 (di erence of potential'between I) and o) The elimination of ux and 'v1 between equations (5)and (6) gives:

1 100 (n 1:.{1+(b.+-R) een 1 y ="'z{aiZ1`(b1+R :l Equation (7') showsthat the relation 105 determines the condition that the current 1 11,shall be zero and consequentlyV the elmo` l u e expression (8).,can bewritten:

zl a* a, z, The manipulation ot' the shunt R combined, 1f necessary,with the regulation of 130 the temperature of the filament of the valveA, will permit this condition (9) to be realized. If 1c, denotes theconstant of amplification of the valve A1, the shunt being removed, theabsolute value of the relation yIf the factor z2 is greater than c, z itwill be suliicient to reverse the connections, thereby interchanging a,and a, in order to render the regulation possible.

The means for regulating the tricde valve also permits of realizing aduplicate mounting which as is known, consists in joiningthe Atwo inetrunks by a double budge which only permits the transformation of energyin one direction for each of the brid es; this system avoids thereactions of one me trunk on the other.

Fig. 3 shows circuit arrangements for this.

case.

In the diagram, a', and a', represent arti ficial lines satisfying theconditions In particular, if a, b, -l-II and a: b2 i. v 2

it will be suicient to take .2',:51 and 522,22, but this is notnecessary.

Under these conditions an eiectromotive force from the line L, L',applied between o1 and a, will give rise after amplification in A2,., toan electromotive force applied between the terminals a, and b2. Currentwill circulate in the line L2 L2 in series with tbe impedance :'but therelay A2, will not act. The action will take place in an identicallysimilar manner for a transmission from L2 L', to L1 L1.

It is vunderstood that the arrangements described by wav of example arenot imitcd and that modifications can be made without departing from`the characteristic features of tbe invention. In particular, thecharacteristics of the balancing valve instead of being controlled bythe shunt could be controlled by any other means, for example by modiing the temperature of the valve or the vo tage of the plate battery.

Having thus described the nature of the sald invention and the bestmeans I know eoI practical eiect,

tplate electrode,

valve containing filament. p

2 An amplifying relay allowing communication in both directions betweentwo line circuits of any characteristics and comprising in combinationan amplifying triode valve and a balancing triode valve, each valvecontaining a lament, a grid and a late electrede, batteries for heatingsaid ii amante, a. transformer comprising primary and ser` ondary coils,the said primary coil` bei inserted in one line wire and the said seconary between the grid and the filament of said amplifying valve and asecond transformer comprising primary and seconder coils, the said lastmentioned secondary coil forming a connection between the two lines, thelast mentioned primary the plate of the am negative pole of the ment,and means for altering the temperature of the filaments of said valvesand means for altering the'voltage applied to' the plate electrode ofthe balancing valve.

3. An, amplifying relay allowing-commu-A nication inboth directionsbetween two line circuits of an characteristics and comprising incombination an amplifying triode va ve and a balancing triode valve,each valve containing a filament, a grid and av plate electrode,batteries vfor'Jxeating said filaments, a transformer comprising primaryand secondary coils, an adjudsable shunt connected between theplate ofsaidV balancin battery igor heating the llament'o said balancing valve,the grid of said balancing valve bein connected to Aone line of acircuit and tile plate electrode of said balancing valve being connected'through the primary coil of said rst mentioned transformer to the coresponding-line of the lifying valve and the other circuit. f l.

4. An ampliying'relay allowing communication in both directions betweentwo line circuits of any characteristics and comprismg in combinationanamplifying triode va ve and a balancing triode valve', each said lastmentioned secondary coil being inserted between attery heating itsfilavalve and the negative pole of the y V valve containing a filament,a grid and a 'l Slate electrode, batteries for heating Vsaid laments, atransformer comprising prima and secondary cols,..one end of saidprimary coil being connected to the common junction of the corres endingline wires of the two circuits and t e other end of said rimary beingconnected to the late of said balancing valve, the ends of saidsecondary coil being connected respectively to the negative pole of thebattery for heating the filam'ent of said amplifying valve and to thegrid of said amplifying valve, a second transformer comprising primaryand secondary coils, the ends of said primary bein connected,respective] to the plate of sai amplifying valve an' to the negativepole of the filament of said amplifying valve, and the ends of Saidsecondary being connected, respectively-to line wires of .one circuitand to the corresponding line wires of the other circuit.

5. An amplifying relay allowing communication in both directions betweentwo line circuits of any characteristics and comprisin in combination anamplifying triode va ve and a balancing triode valve, each valvecontaining a filament, a grid anda late electrode, batteries for heatingsaid Elements, a transformer comprising primary and secondary coilsoneend of said primary coil being connected to the common )unctipn of thecorrespondin lines of the two circuits and the othercnd o said primarybeing connected to the plate of said balancing valve, the ends of saidsecondary coil being connected, m pectively, to the negative pole of thebattery for heating the filament of said amplifying valve and to thegrid of said amplifying valve, aV second transformer comprisingrimarynand secondary coils, the ends of sai prima ibeing connected,respectively, to the plate of said amplifying valve and to the negativepol'e of the filament of said amplifying valve, the ends of saidsecondary being connected, respectivel to a line of one circuit and tothe correspon ing line of the other-'oircuit, an adjustable shunt beinginserted between the negative pole of the battery heating the filamentof the balancin valve and the plate of, said balancing va ve.

An am lifying relay allo-wing communication in oth directions betweentwo line circuits of any characteristics and comprising in combinationan amplifying triode valve and a balancing triode valve, each Avalvecontaining a filament, a grid and a plate electrode, batteries forheating said filaments, a transformer comprising primary and 'secondarycoils, one end ot'sa'd primary coil being connected to the comm n)unction of the corresponding line wires of the two circuits and theother end of said primary grid of said amplifying valve, a secondtransformer comprising primary and secondary coils, the ends of saidprimary being connected respectively, to the plate of said amplifyingvalve and tothe negative pole of the filament of said amlifying valve,the ends of said secondary ing connected, respectively, to line wires ofone circuit and to the corresponding line wires of the other circuit,two circuits coniprising capacities and inductances, a batteryenergizing said two circuits in parallel, said circuits substantially`balanced and connected at similar points thereof to the iespectiveplate electrodes of said valves.

7. An amplifying relay allowing coma munication in both directionsbetween two' line circuits of any characteristics and comprising incombination an amplifying triode valve and a balancing trio e valve,each valve containing a filament, a grid and a plate electrode,batteries for heating said laments, a. transformer comprising primaryand secondary coils, one end of said primary coil being connected to thecommon junction of the corresponding line wires of the two circuits andthe other end of said primar being connected to the late of said baancing valve, the ends of siii second-r ary coil being connected,respectively2 to the negative pole of the battery for heating thefilament of said am lifying valve and to the grid of said amp ifyingvalve, a second transformer. comprisin primary and secondary coils, theen s of said primary being connected, respectively, to the plate of saidam lifyin valve and to the negative pole o the ii ement of saidamplifying valve, the ends of said secondary being connected,respectively, to a line wire of one circuit and to the corres ondin linewire of the other circuit, an a justab e shunt being inserted betweenthe negative pole of the battery heating the filament of the balancingvalve and the plate of said balancing valve, two circuits comprisingcapacities and indnctances, a battery energizing said two circuits in.parallel, two symmetrically disposed points oir these circuits beingconnected, respectively, to the lates of the amplifying and balancing vaves.

8. Amplifying relays'allowing communication in both directions betweentwo line circuits -of any characteristics, a d comprisin in combinationan ampli ing triode va ve and a balancing triode valve in each circuit,each valve containing a filament a grid and a Iplate electrode batteriesi or heating said laments, transformers in each line circuit eachtransformer, an artificial line in each circuit, the ends of saidprimary coils being connected. res ectively, to the plate electrodes ofsaid ba anciug valves and to one end of said artificial lines and theends of primary and secondary coils in` plate electrode said secondarycoils being connected, respectively, to the negative ends of thebatteries heating the filaments of said amplifying valves and to thegrids of said amplifying valves, a second transformer in each circuit,primary and secondary coils in each of last mentioned transformers, theends of said primary coils being connected, respectively, to the ne tivepoles of the batteries heating the li aments of said amplifying valvesand to the grids of said amplifying valves, the said secondai,V coilsbeing inseited, ref spectively, in eac line circuit and means foraltering vthe voltage applied to the of said valves and means foraltering the temperature of said filaments.

9. Amplifying relays allowing communication in both directions betweentwo line circuits of an characteristics, and comprisin in combination anamplifying triode Yva ve and a balancing triode valve in eacli valvecontaining a filament a circuit, each grid and a plate electrode,batteries or heating said filaments, transformers in each line circuitprimary and secondary coils in each transformer, an artificial line ineach line circuit, the ends of said priinary coils being connected,respectivelyfto the plate electrodes of said balancing Vvalves and tovalves, the grids of Vmentioned transformers one end of said artificiallines and the ends of said secondary coils being connected,respectively, to the ne ative"e'iids of the batteries heating the fiamants of said amplifying valves and to the grids of said aniplifyingvalves, a second transformer in each circuit, "primar and secondarycoils in each of last mentioned transformers, the ends of said primarycoils being connected, respectively, to the negative poles of thebatteries heating the filaments of said aniplifying valves and to thegrids of said amplifying valves, the said secondary coils beinginserted, res ectively, in each line `circuit `and adjusta le shuntsconnected between the plates of said balancing valves and the negativepoles of the batteries for heating the filaments of said balancing eachof the balancing valves being connected to one line Wire of acorresponding line circuit and the plate electrodes of said balancingvalves being connected through thfe'primary coils of said first to therespective circuits.

In testimony that l claim the foregoing as my invention, l have signedmy name.

JULES ERNEST LOUIS PUGET.

